package com.itttq.gshop.wx;

import java.security.MessageDigest;
import java.util.Arrays;

import javax.servlet.http.HttpServletRequest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SpringBootApplication
@RestController
public class GshopWxApplication extends WebMvcConfigurerAdapter {
	private static String TOKEN = "YOPIN4tROP5Idr2MD";
	public static void main(String[] args) {
		SpringApplication.run(GshopWxApplication.class, args);
	}
	
	@RequestMapping("url")
	public String url() {
		return "http://www.baidu.com";
	}
	
	@RequestMapping("")
	public String auth(HttpServletRequest request) {
		// 微信加密签名  
	     String signature = request.getParameter("signature");  
	     // 随机字符串  
	     String echostr = request.getParameter("echostr");  
	     // 时间戳  
	     String timestamp = request.getParameter("timestamp");  
	     // 随机数  
	     String nonce = request.getParameter("nonce");  
	     boolean rs = checkSignature(signature, timestamp, nonce);
	     if(rs) {
	    	 return echostr;
	     }
		return "wrong";
	}
	
	public static boolean checkSignature(String signature,String timestamp,String nonce){
        String[] arr = new String[] {TOKEN, timestamp, nonce};
        //排序
        Arrays.sort(arr);
        //生成字符串
        StringBuffer content = new StringBuffer();
        for(int i=0;i<arr.length;i++){
            content.append(arr[i]);
        }
        //sha1加密
        String temp = getSha1(content.toString());
        return temp.equals(signature);
    }

    /**
     * Sha1加密方法
     * @param str
     * @return
     */
    public static String getSha1(String str) {
        if (str == null || str.length() == 0) {
            return null;
        }
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("UTF-8"));

            byte[] md = mdTemp.digest();
            int j = md.length;
            char buf[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (Exception e) {
            return null;
        }
    }
}
